TYP/CLN: bump openpyxl vertion to fix import error pandas-dev#36021

Author: fangchenli

ci/deps/azure-37-locale_slow.yaml

@@ -18,7 +18,7 @@ dependencies:
   - lxml
   - matplotlib=3.0.0
   - numpy=1.16.*
-  - openpyxl=2.5.7
+  - openpyxl=2.6.0
   - python-dateutil
   - python-blosc
   - pytz=2017.3

ci/deps/azure-37-minimum_versions.yaml

@@ -19,7 +19,7 @@ dependencies:
   - numba=0.46.0
   - numexpr=2.6.8
   - numpy=1.16.5
-  - openpyxl=2.5.7
+  - openpyxl=2.6.0
   - pytables=3.4.4
   - python-dateutil=2.7.3
   - pytz=2017.3